Average Velocity

Q.

$36km/hr=$ ___ $m/s$

Q. Question 8
The speed-time graph for a car is shown in below figure:

(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.
(b) Which part of the graph represents uniform motion of the car?

Q.

A body moves with a velocity of 10 m/s for 10 s and then with a velocity of 20 m/s in the same direction for 40 s. Find its average velocity.

Q. Average speed will be equal to the average velocity when

1. displacement is zero.
2. distance is greater than displacement.
3. distance is less than displacement
4. distance is equal to displacement.

Q.

A train travels with a speed of 60km/h from station A to station B and then comes back from B to A with a speed of 80km/h find average speed. and average velocity

Q.

A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A.The distance between the two stations is 200 km.Find:(i)the average speed, (ii) the average velocity of the train.

Q.

A body travels with velocity $v_1$ for time $t_1$ second and with velocity $v_2$ for time $t_2$ second in the same direction. Calculate the average velocity of the body.

Q.

Can velocity be zero for a moving body

Q.

Which of the following statements is correct for a round trip along the same route?

1. Average speed is zero in a round trip

2. Average velocity and average speed, both are non-zero

3. Average velocity is non-zero because displacement is non-zero.

4. Average velocity is zero in a round trip

Q. Which of the following can be zero when a particle is in motion for some time?

1. Speed
2. Distance
3. Velocity
4. Displacement

Q.

If a car travels a distance of 120 km with a speed of 80 km/h and returns with a speed of 60 km/h. Calculate the average velocity for the entire journey.

1. 75 km/hr

2. 0 km/hr

3. 45 km/hr

4. 70 km/hr

Q.

What is the unit of the Velocity Ratio(V.R)?

1. square meter

2. meter

3. No unit

4. meter cube

Q.

A taxi was hired for a round trip from city A to B . It covered a distance of 500 km in 7 hours and returned in 6 hours covering 500 km . Find the average speed of the taxi for the whole journey. Is it same as average velocity.

Q.

An artificial satellite is moving in a circular orbit of radius
42250 km. Calculate its speed if it takes 24 hours to revolve
around the earth.

Q.

Solve the problem:

Joseph jogs from one end A to the other end B of a straight 300m road in 2 minutes 30 seconds and then turns around and jogs 100m back to point C in another 1 minute. What are Joseph's average speeds and velocities In jogging (a) from A to B and

(b) from A to C ?

Q.

An auto travels the first half time with a uniform speed, $u$ and the next half time with a uniform speed, v Find its average speed for the complete journey.

1. $\frac{uv}{2}$

2. $2uv$

3. $uv$

4. $\frac{u+v}{2}$

Q.

If you are walking at constant velocity of 8 km/h and a car passed you by at the speed of 20

km/h from behind, what is the car's velocity from your viewpoint?

1. 12 km/h

2. 30 km/h

3. 40 km/h

4. 38 km/h

Q. A bus appears to move northwards at a speed of 203km h-1, to a man driving his car eastwards with speed 20km h -1. Find the velocity of the bus w.r.t.ground.

Q.

A car travels first 30km with a uniform speed of 60 km/h and then next 30 km with a uniform speed of 40 km/h. Calculate :(i) the total time of journey, (ii) the average speed of the car.

Q.

Assertion (A): A body may have velocity and displacement in the opposite directions.

Reason (R): Velocity is the distance traveled by the body in a unit of time.

1. A and R are correct and R is the correct explanation for A.

2. A and R are correct but R is not the correct explanation for A.

3. A is correct but R is incorrect.

4. Both A and R are incorrect

Q.

A train travels with a speed of 60 km h-¹ from station A to station B and then comes back with a speed 80 km h-¹ from station B to station A. Find (i) the average speed, and (i i) the average velocity of train.

Q.

our Results For

A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.

Q.

Assertion (A): Velocity is a vector.

Reason (R): Velocity has both magnitude and direction.

1. A and R are true and R is the correct explanation of A.

2. A and R are true, but R is not the correct explanation of A.

3. A is true but R is false.

4. Both A and R are false.

Q.

A train covers 50 km with the speed of 100 km per hour and another 50 km with a speed of 50 km per hour. Find the average velocity.

Q.

Why formula of velocity is like : displacement/time . What is the need of displacement Over here in this formula.

Q.

If an object is moving in circular path then average velocity can be zero even If the average speed is not zero

Q. Now we have to find the avg velocity
and the formula is displacement by time
now how to find displacement

Q.

Why speed is related to velocity as the displacement is different from distance.

Q. If the acceleration-time graph of a body moving with uniform retardation is a straight line parallel to time axis, then

1. Final velocity must be negative always
2. Final velocity is less than the initial velocity
3. Acceleration is positive
4. Speed of the body remains constant

Q.

A train travels with a speed of 60 km/h fron station A to B and then comes back with a speed 80km/h from station B to A. Find: (i) the average speed, and (ii) the average velocity of the train.